Share 'The Origins of Valentine's Day'

What is Valentine's Day to you? A special day with your sweetheart? An excuse to wear red and pink? A chance to eat chocolate all day? A day to exchange gifts with the special people in your life? Just another Hallmark-Holiday?
For me personally it's a day to do something special for my sweetheart. I do also feel that it is a bit too commercialized, and another Hallmark-Holiday used to guilt p…